<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <!-- <img src="../assets/logo.jpg" alt=""> -->
                <span>电商管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主题区 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单 -->
                <el-menu
                    background-color="#fff"
                    text-color="#999"
                    active-text-color="#74b9ff"
                    :unique-opened="true"
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    :router="true"
                    :default-active="activePath"
                >
                    <!-- 上面属性default-active可以设置为$route.path? -->

                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <i class="el-icon-location"></i>
                            <span>{{ item.authName }}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item
                            :index="'/' + subItem.path"
                            v-for="subItem in item.children"
                            :key="subItem.id"
                            @click="saveNavState('/' + subItem.path)"
                        >
                            <template slot="title">{{subItem.authName}}</template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容主题 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data() {
        return {
            //左侧菜单数据
            menuList: [],
            //是否折叠
            isCollapse: false,
            //被激活的链接地址
            activePath: ''
        };
    },
    created() {
        this.getMenuList();
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            window.sessionStorage.clear();
            this.$router.push("/login");
        },
        //获取所有的菜单
        async getMenuList() {
            const { data: res } = await this.$http.get("menus");
            if (res.meta.status !== 200)
                return this.$message.error(res.meta.msg);
            this.menuList = res.data;
        },
        //点击按钮，实现菜单的折叠和展开
        toggleCollapse() {
            this.isCollapse = !this.isCollapse;
        },
        //保存链接的激活状态
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
};
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background-color: #74b9ff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div {
        display: flex;
        align-items: center;
    }
}
.el-aside {
    background-color: #fff;
    .el-menu {
        border-right: none;
    }
}
.el-main {
    background-color: #f5f6fa;
}
.toggle-button {
    height: 40px;
    background-color: #ccc;
    font-size: 16px;
    line-height: 35px;
    color: #999;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>